          new function (){
             var _self = this;
             _self.width = 640;//设置默认最大宽度
             _self.fontSize = 100;//默认字体大小
             _self.widthProportion = function(){var p = (document.body&&document.body.clientWidth||document.getElementsByTagName("html")[0].offsetWidth)/_self.width;return p>1?1:p<0.5?0.5:p;};
             _self.changePage = function(){
                 document.getElementsByTagName("html")[0].setAttribute("style","font-size:"+_self.widthProportion()*_self.fontSize+"px !important");
             }
             _self.changePage();
             window.addEventListener('resize',function(){_self.changePage();},false);
          };